News Releases Details

Los Azules Copper Project Continues to Grow; Potential New Parallel Trend Emerging Mineralization Extending to Depth & to the East

TORONTO, ONTARIO--(Marketwire - Jan. 17, 2013) -McEwen Mining Inc. (NYSE:MUX)(TSX:MUX) today announced that its exploration efforts at the Los Azules Copper Project in San Juan Province, Argentina, continues to show significant potential to increase the size of the resource. The first ten drill holes completed and assayed have been successful in extending the mineralization both laterally to the east and to depth. In addition, the drilling appears to have identified a parallel mineralized trend to the southwest of the main part of the existing resource.

Exploration Highlights

A possible parallel mineralized trend may be emerging southwest of the resource. Good grades over long intervals have been intersected, highlights of which include 0.61% copper over 160 meters and 0.49% copper over 329 meters both in Hole 1291, 0.87% copper over 69 meters in Hole 12101 and 0.44% copper over 529 meters in Hole 1299, with each hole ending in mineralization.

Drill hole 1294 successfully extended the known copper mineralization 200 meters below the limits of the current resource. The total intersection of the hole assayed 0.47% copper over 610 meters meters and included 0.95% copper over 68 meters and 0.65% copper over 100 meters. A second drill hole, 1299, assayed 0.44% copper over 529 meters. This drill hole ended approximately 600 meters below the resource outline.

Drill hole 1289 was designed to target new mineralization further to the east. It was successful and returned 0.44% copper over 147 meters. This hole was drilled 150 meters east of any prior drilling.

The Company expects to release an updated resource estimate for Los Azules which incorporates these recent results in Mid-February.

TABLE 1. LOS AZULES EXPLORATION HIGHLIGHTS

Hole

From(m)

To(m)

Thickness(m)

Copper Grade(%)

1291

72

232

160

0.61

And

562

890.5

328.5

0.49

including

790

890.5

100.5

0.71

1294

252

861.9

609.9

0.47

including

268

336

68

0.95

Including

560

660

100

0.65

1299

546

1074.6

528.6

0.44

The Company was successful in starting drilling in October, two months earlier than prior seasons. In addition, the drilling has consistently achieved drill hole depths greater than 700 meters with Hole 1299 drilled to a depth of 1,075 meters. Significantly, all of the deeper drill holes ended in mineralization. Drilling will continue to focus on expanding the resource. This season's exploration program is on track to achieve its objective of completing 15,000 meters of drilling by the end of April.

Earlier this month, the company hired BMO Capital Markets to market Los Azules.

About the Los Azules Copper Project

Los Azules is a large copper porphyry system located in western San Juan Province within a belt of porphyry copper deposits that straddles the Chilean/Argentine border. This belt contains some of the world's largest copper deposits, including Codelco's El Teniente and Andina mines,
Anglo American's
Los Bronces mine, Antofagasta PLC's Los Pelambres mine and Xstrata's El Pachón project, among others. Los Azules is one of the world's largest, highest grade, undeveloped copper-porphyry deposits not owned by a major base metal company.

The mineral resources for Los Azules were calculated in June 2012 and are summarized in the table below with a cut-off grade of 0.35% copper.

The goal of McEwen Mining is to qualify for inclusion in the S&P 500 by 2015 by creating a high growth, low-cost, mid-tier gold producer focused in the Americas. McEwen Mining's principal assets consist of the San José Mine in Santa Cruz, Argentina (49% interest); the El Gallo Complex in Sinaloa, Mexico; the Gold Bar Project in Nevada, US; the Los Azules Project in San Juan, Argentina and a large portfolio of exploration properties in Argentina, Nevada and Mexico.

McEwen Mining has 296,024,859 shares issued and outstanding.
Rob McEwen
, Chairman, President and Chief Owner, owns approximately 25% of the shares of the Company. As of December 31, 2012, McEwen Mining had cash and liquid assets of approximately US$70 million and is debt free.

Technical Information

James K. Duff
, Senior Consultant to the Company and a Registered Member in good standing of the Society for Mining, Metallurgy and Exploration, who is a Qualified Person as defined by National Instrument 43-101 ("NI 43-101") has reviewed and approved the technical contents of this news release.
Bruce Davis
, PhD, FAusIMM, who is a Qualified Person as defined by NI 43-101 and responsible for the quality control for the assaying of the Los Azules drill core has reviewed the assay quality control information. All samples were collected in accordance with industry standards. Splits from the drill core samples were submitted to the laboratory of Alex Stewart International in Mendoza, Argentina for fire assay and ICP analysis. Accuracy of results is tested through the systematic inclusion of standards, blanks and check assays.

For additional information about the Los Azules project see the Technical Report titled "Los Azules Porphyry Copper Project, San Juan Province, Argentina" dated August 1, 2012, with an effective date of June 15, 2012, prepared by
D. Ernest Winkler
, P.Eng,
Robert Sim
, P.Geo,
Bruce Davis
, PhD, FAusIMM and
James K. Duff
, P.Geo, all of whom are qualified persons and all of whom are independent of McEwen Mining, each as defined by NI 43-101. The foregoing report is available under the Corporation's profile on SEDAR (www.sedar.com).

Cautionary Note to U.S. Investors

McEwen Mining reports its resource estimates in accordance with standards of the Canadian Institute of Mining, Metallurgy and Petroleum referred to in Canadian National Instrument 43-101 (NI 43-101). These standards are different from the standards generally permitted in reports filed with the SEC. Under NI 43-101, McEwen Mining reports measured, indicated and inferred resources, measurements which are generally not permitted in filings made with the SEC. According to Canadian NI 43-101 criteria, the estimation of measured resources and indicated resources involve greater uncertainty as to their economic feasibility than the estimation of proven and probable reserves. Under SEC Industry Guide 7 criteria, measured, indicated and inferred resources are considered Mineralized Material. The SEC considers that in addition to greater uncertainty as to the economic feasibility of Mineralized Material compared to proven and probable reserves, there is also greater uncertainty as to the existence of Mineralized Material. U.S. investors are cautioned not to assume that measured or indicated resources will be converted into economically mineable reserves. The estimation of inferred resources involves far greater uncertainty as to their existence and economic viability than the estimation of other categories of resources.

Caution Concerning Forward-Looking Statements

This press release contains certain forward-looking statements and information, including "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. The forward-looking statements and information expressed, as at the date of this press release, McEwen Mining Inc.'s (the "Company") estimates, forecasts, projections, expectations or beliefs as to future events and results. Forward-looking statements and information are necessarily based upon a number of estimates and assumptions that, while considered reasonable by management, are inherently subject to significant business, economic and competitive uncertainties, risks and contingencies, and there can be no assurance that such statements and information will prove to be accurate. Therefore, actual results and future events could differ materially from those anticipated in such statements and information. Risks and uncertainties that could cause results or future events to differ materially from current expectations expressed or implied by the forward-looking statements and information include, but are not limited to, risks related to the cost of transferring or otherwise allocating funds between operating jurisdictions, factors associated with fluctuations in the market price of precious metals, mining industry risks, political, economic, social and security risks associated with foreign operations, risks associated with the construction of mining operations and commencement of production and the projected costs thereof, risks related to litigation, property title, the state of the capital markets, environmental risks and hazards, uncertainty as to calculation of mineral resources and reserves and other risks. Readers should not place undue reliance on forward-looking statements or information included herein, which speak only as of the date hereof. The Company undertakes no obligation to reissue or update forward-looking statements or information as a result of new information or events after the date hereof except as may be required by law. See McEwen Mining's Annual Report on Form 10-K for the fiscal year ended December 31, 2011 and other filings with the Securities and Exchange Commission, under the caption "Risk Factors", for additional information on risks, uncertainties and other factors relating to the forward-looking statements and information regarding the Company. All forward-looking statements and information made in this news release are qualified by this cautionary statement.

Table 2 - Summary of Drill Hole Results for the First Half of the 2012/13 Drill Season

Hole

Northing

Easting

Dip

From (m)

To
(m)

Thickness (m)

Cu
(%)

Zone

1284

6558652

2383287

90°

0

52

52

-

Overburden

52

74

22

0.19

Mixed oxide and weak secondary enrichment

74

380

306

0.19

Primary chalcopyrite in fractures with minor bornite

380

464

84

0.38

Primary chalcopyrite and bornite in fractures

464

580

116

0.25

Primary chalcopyrite and bornite in fractures

580

1022.5

442.5

0.37

Primary chalcopyrite and bornite in fractures

Infill hole completed to target depth. Average core recovery was 96%.

1285

6558327

2383437

90°

0

41.5

41.5

-

Overburden

41.5

60

18.5

0.05

Leached cap

60

162

102

0.18

Transition zone

162

430

268

0.14

Primary chalcopyrite >>bornite in fractures

430

484

54

0.45

Primary chalcopyrite >>bornite in fractures

484

666

182

0.23

Primary chalcopyrite >>bornite in fractures

666

736

70

0.35

Primary chalcopyrite >>bornite in fractures

Infill hole completed to target depth. Average core recovery was 89%.

1286

6558138

2383470

90°

0

40

40

-

Overburden

40

106

66

0.05

Leached cap

106

264

158

0.22

Partially enriched chalcopyrite >chalcocite

264

335.5

71.5

0.12

Primary chalcopyrite in fractures >>disseminations

Infill hole lost at 335.5 m before reaching target depth. Average core recovery was 86%.